JPS5858324A - Anchor rod - Google Patents

Abstract

PURPOSE:To raise the drawing resistance of anochor rods by a method in which an anchor rod having u-shaped notches on its wall and a closing metal on its tip end opening is covered with a heat-shrink tube and penetrated into the ground, and an expandible mateial is injected through the rear end opening of the rod. CONSTITUTION:An anchor rod A covered with a heat-shrink tube 5 is driven through its closing metal 4 into a banking 8, and then an expandible material 9 is injected through the rear end opening 1b of the rod A. The expandible material 9 injected expands and bardens to produce a maximum expansion pressure after the lapse of about 12-24hrs, whereby the heat-shrink tube 5 is broken and u-shaped tongue pieces 3 erect. By this, the anchor rod body 1 is expanded to give a drawing resistance to the anchor rod A.

Description

[Detailed Description of the Invention] The present invention relates to an anchor rod used in construction or civil engineering work. In particular, it is used to prevent the collapse of steps of various sizes formed on land such as cliffs, embankments, or river embankments. This glazed anchor rod is suitable for use in constructing or reinforcing retaining walls. These anchor rods are usually manufactured at the LI IAb construction site.For example, the tip [this] has a fixed driving head, and this driving head [this] has a structure that can be opened and closed by rotating. The anchor rod body, which is made of a steel rod or steel pipe on which multiple locking pieces are arranged and fixed, is inserted into a pre-drilled hole in the embankment or cut, and then the anchor rod body is rotated. After the surrounding soil layer is excavated with the expanded locking piece, mortar, concrete, synthetic resin, etc. is injected into the excavated hole to form a castle-like body at the tip of the anchor rod body. Anchor rods with pull-out resistance were constructed by this process.However, in conventional anchor rods manufactured in this way, the lump at the tip tends to be eccentric with respect to the axis. In addition, in order to form a lump at the tip, a hole with a larger diameter than the pre-drilled hole had to be made at the tip, so two types of excavators were required. Or, other construction machinery such as a means of rotating the anchor rod body was required, and moreover, it required some ingenuity to dispose of the soil generated from re-excavation.As a result, conventional anchor rods were difficult to bend. It had become a thing.

Furthermore, these problems in manufacturing conventional anchor rods have placed significant restrictions on the construction of retaining walls, for example, within the anchor rod.

In other words, manufacturing conventional anchor rods requires drilling holes with a relatively large diameter, making it difficult to construct retaining walls on soft embankments or cuttings. Ta. In addition, not only a large excavator but also other machines such as means for rotating the anchor rod are required, so moving these construction machines not only impairs work efficiency, but also requires a relatively large construction area. This not only increased the number of days and costs required for construction, but also posed the problem of difficulty in construction in areas with a high concentration of people's homes and facilities.

Therefore, the inventor of the present invention has proposed the above-mentioned conventional drawbacks.
And in order to solve the problem, we proposed an anchor rod that can be easily manufactured and has extremely high resistance to being pulled out of the ground (particularly (1)
).

The present invention 4-11 relates to the invention related to the improvement of the invention described in J-Note 7- above. In other words, when the width of the V-cut on the peripheral wall of the anchor rod body is wide, or when the grain size of the earth and sand that makes up the embankment or cut is small, or when the moisture content of the embankment or cut-and-dried soil is high, , Anchor rods were cut or poured or buried.
In order to solve the problem of dirt, water, etc. entering the anchor rod body through the cut section and inhibiting the tensioning effect of the injected tensioning agent, we It is intended to provide an anchor rod that can be fitted.

Therefore, the anchor rod of the present invention has a circumference T & I of the anchor rod body made of a cylindrical body. A substantially U-shaped cut is provided at the base of the anchor rod body facing toward the rear end of the anchor rod body, and a closing fitting is attached to the tip opening of the anchor rod body. 9. Inject and hold the above anchor rod body.
It is characterized by being constructed by fitting.

Next, embodiments of the present invention will be described based on the attached drawings.

FIG. 1 is an exploded partial perspective view showing one embodiment of the present invention. In the figure, (1) is an anchor rod body made of a cylindrical body made of metal or synthetic resin. The anchor rod body (1) has a plurality of opposite U-shaped cuts (2) at the rear end of the anchor rod body (1) (see Fig. 2). These cuts (2)... (U-shaped tongue pieces (3)...
is formed. (4) is a closing fitting, which is attached by press-fitting and fixing the rear end (llb) to the tip opening (/a) of the anchor rod body (1). The closure fitting (4) prevents soil from entering the anchor rod body (1) in the ground, and also closes the rear end opening (/b) of the anchor rod body (1).
) A storage chamber for the expansion agent is formed in which the expansion agent is injected and stored. Note that this closing fitting is for pouring, and the tip (+
a) Gj has a sharp shape. (5) is a heat-shrinkable vinyl chloride tube whose inner diameter is slightly larger than the row diameter of anchor rod main body (I4+: (1)), and this tube (5) is installed in anchor rod main body (1). L
Attach the anchor rod body (1) to the outside so that the iJth part is completely covered. The infiltration of earth, sand, water, etc. from the cutting of the anchor rod body (1) 1-1 (21...) in the ground is completely prevented.

In this way, the anchor rod body (1) and the closing fitting (4
) and a heat-shrinkable vinyl chloride tube (5) constitute an anchor rod (A). In addition, when placing embankment or cutting, etc., the tube (5) should be filled with approximately 70 to 70 mm.
Pour boiling water in step C, heat shrink it, and attach the anchor rod body (
1) Fix G.

As explained above, in the above actual example, the U-shaped cut (2) and
...is extremely easy to manufacture, as it is constructed by simply attaching the obturator J4 (41) to the tip opening (/a) and fitting the heat-shrinkable tube (5) to the outside. It is inexpensive.Also, since the heat-shrinkable tube (!5) is inserted into the anchor rod body (1), the cut (2) of the anchor rod body (1)
1. Since the infiltration of soil, water, etc. is completely prevented from ... , It is also effective for cutting. At the construction site, after being cast or buried, the expansion agent may be injected from the rear end opening (/b) of the anchor rod body (1) due to its expansion pressure.
Break the tube (5) and make a U-shaped tongue piece (3)...
When the anchor rod stands up, the surrounding anchor rod body (
1) becomes enormous, so the attraction resistance in the ground becomes extremely high. In addition, as explained below, it is only necessary to make cuts (2)... in the peripheral wall of the anchor rod body (1) at the factory and then cast the anchor rod at the site. Since it is sufficient to drill a hole with a diameter approximately equal to the diameter of the rod body (1), construction of retaining walls and the like can be carried out quickly and economically.

In addition, in the above embodiment, the anchor rod body (1
) consists of a cylindrical body, but a hollow prism may also be used.

The shape of the cut is not limited to a strict U-shape, for example,
] shape, semi-circular, U-shaped or 7-shaped, etc., and the shape does not matter as long as the AU IA5 section faces the rear end of the anchor rod body. Another cut t! vl
j % Anchor IU It is preferable to have as many anchors as possible so as not to have a large effect qp on the strength of one anchor, but it is preferable to install this as close to the tip of the anchor as possible, and the same circumference of the 1M wall. -I-, & It is sufficient to provide about 3 melons. In the above example 9, a closing fitting (4) is installed at the tip opening (/a) of the anchor rod body (1).
) are press-fitted, but the distal end opening of the anchor rod body and the closing fitting may be male and female threaded together, or the closing fitting may be formed integrally with the anchor rod. As the anchor rod for burying, a closing metal fitting having a flat tip with a nozzle shape as shown in Fig. 3 may be used.

Further, although the heat-shrinkable tube (5) made of vinyl chloride resin is used in Example No.-A, it may be made of nylon resin, polyester resin, polypropylene resin, or the like. From the viewpoint of chemical resistance, water resistance, weather resistance, and physical strength, vinyl chloride product name) is preferably used. Both ends of the tube (5) are open, but especially if it is for burial, the tip is open.
The best part is that each end of the anchor rod may have a bottom, and the anchor rod body may be covered with a closure fitting from one bottomed heat shrink tube.

Hereinafter, an example of a retaining wall reinforcement method that can be implemented by employing the anchor rod (A) of the above embodiment for pouring will be explained. explain.

First, the tube (
5) is poured with hot water at about 0°C to heat shrink the tube (5) and fix it to the anchor rod body (1). Next, insert a plurality of anchor rods (A) into the retaining wall (6) through holes (7) drilled at predetermined intervals at an acute angle to the vertical axis of the retaining wall. into the embankment (8) to the desired depth. This anchor rod ((to)
(The upper part of the retaining wall (6) [・This is relatively short,
It is preferable to use gradually longer anchor rods at the bottom. However, this method is not necessarily limited to one method, and long anchor rods and long anchor rods may be inserted alternately. If the ground is soft, it is preferable to use a long rod once a month. Even if the anchor rod (A) is driven into the embankment (8) in this way, the tube (5) is still hidden, so the embankment The dirt inside,
Moisture number J Anchor Rondo body (1) & Infiltration (
"do not have.

Each anchor rod (A) driven in this way...
Cut the thickening agent (9) from 0 (/b) between the rear ends [, 1 (2 +
Inject to the position where ... is provided. It is a mixture of this swelling agent, an inorganic compound mainly composed of silicon salt, a specific silicon compound, and water. For example, a mixture of Plaister (trade name) manufactured by Ono I Cement Co., Ltd. and water can be suitably used. 41. Alternatively, a mixture of cement, mortar, etc. from Sankei may be used with this expanding agent.

The injected expansion stitch 9) hardens enormously and usually shows the maximum expansion pressure after about 1/2 to 2 hours, and as shown in Figure S, this expansion pressure causes the U-shaped tongue piece (3) to form. ...(Go, the tube (5) is broken 1 and stands up, and the anchor rod (A) has pull-out resistance. Figure 3 shows the state where the tongue piece (3)... is upright. The broken tube (5
) is a partial perspective view of the anchor rod main body (1) shown with the 71st W Ll expansion agent omitted, and is a Y-yd sectional view of FIG. Coupled with the erection of the tongue piece (3)..., the area around the cut (2)... of the anchor rod body (1) becomes enormous (huge U5 (11)...). Compressive stress is applied to the surrounding soil layer, resulting in consolidation. As a result, a frictional force is generated between the anchor rod (A) and the embankment.

After the expansion of the expansion agent (9) is completed, a closing fitting is attached to the rear end opening of each anchor rod (A) protruding from the retaining wall (6), and each anchor rod (A) is tightened by tightening means such as a nut. ) to add tension to... By applying this kind of tension, the tongue piece (3) stands up further due to the resistance on the scale, and the anchor rod (A)...
・The pull-out resistance &co becomes even greater.

As described above, the reinforcement of the retaining wall employing the above embodiment of the anchor rod of the present invention is completed. Incidentally, if the rear end of the retaining wall of each anchor rod (A) is undesirably exposed, the surface 1 may be damaged.

In this way (when reinforcing this retaining wall), the pull-out resistance of the anchor rod (A) of the above-mentioned embodiment of the present invention is extremely high, so even if a relatively short and small tC rod is adopted, a sufficient effect can be obtained. However, since the tube (5) has a small number of self-films, it is suitable for use in weak embankments and cuttings with small soil particle size and high moisture content. It can also be effectively used for retaining walls constructed in the like.In addition, for example, the spraying method can provide good stability even to thin retaining walls such as those made of rough concrete layers.

It is only necessary to make a cut (2)... in the peripheral wall of the anchor rod body (1) at the factory and bury it at the site to a depth of #-11F, so there is no need for many construction machines, and therefore, there is no need for a lot of construction machinery. It becomes easier to move construction machinery. As a result, even if the temporary scaffolding is simple, there will be no inconvenience in one face construction, and the construction efficiency will be extremely high. Therefore, there is less need for construction on site, resulting in labor savings, and construction can be carried out easily and quickly even in areas with densely populated houses and facilities.

As explained above, according to the present invention, it is extremely easy to manufacture, and the pull-out resistance in the ground is extremely low. It is possible to provide an anchor rod that can be effectively used for cutting, etc., and furthermore, it is possible to provide an anchor rod that allows construction of retaining walls and the like to be carried out quickly and economically.

[Brief explanation of drawings]

FIG. 1 (, jAn exploded partial perspective view showing an embodiment of the present invention,
Figure 2 is a cross-sectional view taken along the line X-X in Figure 1, Figure 3 is a perspective view showing another embodiment of the closing fitting, and Figure 2 is a cross-sectional view showing another embodiment of the closing fitting. Fig. S is a cross-sectional view showing the state in which the tube is driven into the embankment, and due to the expansion pressure of the expanding agent in the embankment, the tube is broken and the tongue piece formed in the above-mentioned actual river mouth example stands up, and the surrounding area FIG. 3 is a perspective view of the main part of the above embodiment showing a state in which the tongue piece is erected and its surrounding area is expanded, with the broken tube omitted. FIG. 7 is a cross-sectional view showing the expansion agent. It is a sectional view taken along the line Y--Y in the figure shown in 'pA, with ``pA'' omitted. (A) Anchor rod (1) Anchor rod main r; t: (2) Cut (3
)...Language piece (4)...Occluded fitting (5)・
・・Heat shrinkable tube (6)・・Retaining wall
(8)... Embankment (9)... Expansion agent (1
0) ... Huge patent applicant Sekisui House Co., Ltd.

Claims (1)

[Claims] ■) Provide a substantially U-shaped cut in the peripheral wall of the cylindrical anchor rod body with the base facing toward the rear end of the anchor rod body, and attach a closing fitting to the opening at the tip of the anchor rod body, An anchor rod characterized in that an expansion agent or the like is injected and accommodated through a rear end opening of the anchor rod, and a heat-shrinkable tube is fitted onto the anchor rod body so as to cover the cut. .